Seltron ZCE6 Basic, Manual

Page: 20 / 40

20 English
DESCRIPTION OF SYSTEM OPERATION
Parameter C1.2 is used to select the type of thermal actuators connected to the
controller. Type NC opens the thermal actuator when the output is under control
voltage, type NO opens the thermal actuator when there is no control voltage at
the output.
Parameter C2.1 is used to select between three zone control modes:
C2.1=0 - operation after setting the RCD room unit,
C2.1=1 - P control mode,
C2.1=2 - PI control mode,
C2.1=3 - hysteresis control mode.
Parameter C2.6 is used to set the minimum switch-on time for zone output (ther-
mal actuator).
In P and PI control mode, the operating (modulating) time of zone output is cal-
culated on the basis of deviation of measured temperature from required room
temperature within the ED time constant (period). The length of the ED period is
set on the room unit, for each heating zone separately. With parameter C2.3, the
width of the zone is defined, in which the ED modulation is carried out.
With parameter C2.2, the size of the I-constant in PI mode is defined. In case of
greater deviation of measured temperature from required room temperature, I-con-
stant influences the speed of the automatic shift of P zone (+/-0.1°C in one step).
Manual shift of the P zone can be carried out by parameter C2.4 for heating and
parameter C2.5 for cooling.
In hysteresis control mode, the condition (ON/OFF) of zone output is defined on
the basis of deviation of measured temperature from the required room tempera-
ture and the value of set hysteresis. The value of the hysteresis is set on the room
unit, for each heating zone separately.
Zone control (thermal actuators)